Meeting request going as Email

Hi All,

One of my Outlook users having a strange behavior, as when she send meeting request to somebody, sometimes it reaches the other user as an email instead of a meeting request. She is using Outlook 2007 and the Zimbra Connector version 5.0.18_GA_3064_5.0.3066.

When Outlook can't parse the MIME, then we'll send it as an email. Many times this is a third party bug. A lot of times, there will be a local failure associated with this. Also, we did fix a bug in this area (bug 40298) which was fixed in a later version of 5.0.18 and then in 5.0.19

We are using the connector of 5.0.18 as per the suggestion of Zimbra only bcz it fixed some calendar issues especially.
Anyway I will have to upgrade my servers to 6.0, but again there are bugs reported for the upgrades. So waiting to get all fixed.